Palindromes with quiet math
- Killer cages
- Region sum lines
- Whisper lines
- Palindromes
The brief
Normal sudoku rules apply. Place the digits 1-9 once each in every row, column and 3x3 box. Duality line.. (Digits along a grey palindrome must read the same forwards as backwards. Adjacent digits along a green line must differ by at least 5.) Digits in a dotted cage without repeat sum to the total in the top left corner of the cage (if given). Box borders separate the blue line into equal sums. Digits on a orange line must differ by at least 4.